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Security Advisory

USN-4692-1: tar vulnerabilities

Severity

Low

Vendor

Canonical Ubuntu

Versions Affected

  • Canonical Ubuntu 14.04
  • Canonical Ubuntu 16.04
  • Canonical Ubuntu 18.04

Description

Chris Siebenmann discovered that tar incorrectly handled extracting files resized during extraction when invoked with the –sparse flag. An attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 12.04 ESM, Ubuntu 14.04 ESM, Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2018-20482)

Daniel Axtens discovered that tar incorrectly handled certain malformed tar files. If a user or automated system were tricked into processing a specially crafted tar archive, a remote attacker could use this issue to cause tar to crash, resulting in a denial of service. (CVE-2019-9923)

CVEs contained in this USN include: CVE-2018-20482, CVE-2019-9923.

Affected Cloud Foundry Products and Versions

Severity is low unless otherwise noted.

  • cflinuxfs3
    • All versions prior to 0.221.0
  • Xenial Stemcells
    • 456.x versions prior to 456.133
    • 621.x versions prior to 621.97
    • All other stemcells not listed.
  • CF Deployment
    • All versions prior to 16.0.0

Mitigation

Users of affected products are strongly encouraged to follow the mitigations below. The Cloud Foundry project recommends upgrading the following releases:

  • cflinuxfs3
    • Upgrade All versions to 0.221.0 or greater
  • Xenial Stemcells
    • Upgrade 456.x versions to 456.133 or greater
    • Upgrade 621.x versions to 621.97 or greater
    • All other stemcells should be upgraded to the latest version available onĀ bosh.io.
  • CF Deployment
    • Upgrade All versions to 16.0.0 or greater

History

2021-02-10: Initial vulnerability report published.

Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR

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